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  4. A cell of internal resistance is connected across a resistor. A voltmeter having variable resistance G is used to measure potential difference across resistor. The plot of voltmeter reading V against G is shown. What is value of external resistor R ?

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Q. A cell of internal resistance is connected across a resistor. A voltmeter having variable resistance $G$ is used to measure potential difference across resistor. The plot of voltmeter reading $V$ against $G$ is shown. What is value of external resistor $R ?$Physics Question Image

Current Electricity

Solution:

When $G=\infty, V=20\, V$ and no current will pass through voltmeter.
image
$I=\frac{4}{1}=4\, A ; R=\frac{20}{I}=\frac{20}{4}=5\, \Omega$